I had South build me a set of LB limbs for my Coyote FXT a few seasons ago.
Typical South build quality and attention to detail. They were quick, but noticeably a bit louder then my recurve limbs in the same length (62").
Full caveat though, I really didn't go looking at different setups after I got them initially tuned, I'm sure a heavier setup grain wise and maybe some silencers would've quited them down a bunch.
Regretably I sold them setup on another Stalker Coyote FXT riser (the one pictured below) with intentions of ordering a new Stalker Coyote FXT LB or Dingo 1pc, but that has yet to happen.
Save for the different handle config, the profile of the LB Limbs can be seen below during a Turkey hunt w/ decoys.